Half to frank dekum



P. M. LOW.

SPARK ARRESTBR.

Patented Sept. 8, 1891.

(No Model.)

UNITED STA-TES PATENT OFFICE.

PHILIP MARTIN LOW', OF EAST PORTLAND, OREGON, ASSIGNOR OF ONE HALF TOFRANK DEKUM, TRUSTEE, AND GEORGE II. DURHAM, OF

SAME PLACE.

SPARK-ARRESTER.

SPECIFICATION forming part of Letters Patent No. 459,179, datedSeptember 8, 1891.

Application iled February 18, 1891. Serial No. 381,940. (No model.)

T all whom, t may concern:

Be it known that I, PHILIP MARTIN Low, a citizen of the United States,residing at East Portland, in the county of Multnomah and State ofOregon, have invented certain new and useful Improvements inSmoke-Stacks and Spark-Arresters, of which the following is aspecification.

My invention relates to improvements in spark-arresters; and it consistsin the novel construction and arrangement of parts of which thefollowing is a specification.

In theaccompanyingdrawings,in which like reference-signs refer to likeparts throughout the several views, Figure 1 is a cent-ral sectionalview of a smoke-stack attached to a boiler. Fig. 2 is a side view atright angles to Fig. 1, the parts being broken away to show the interiorof the stack. Fig. 3 is a plan view of the stack, the screen anddetlector being removed; and Fig. e is a plan view.

In the drawings, A represents a boiler of the type usually found inlocomotives; but

' my invention may be used with any other class of boilers or furnaces.

B is a smoke-stack, which may be of any section, but is here shown ascircular.

Surrounding the upper portion of the stack is a conical casing C, whichextends from a plane at about the elevation of the top of the stackdownward a considerable distance and inclines toward the stack, so as toiit closely thereto at its lower end.

Upon the upper edge of the casing is supported a spider-frame S,composed of inclined bars 1 and an upper horizontal portion 2. Upon thebars l is iiXed a suitable netting 3 to prevent the direct escape ofsparks which may be thrown out sidewise from the de- Hector. As anadditional means of preventing the escape of sparks I in some instancesprovide a cylindrical netting 15, in the form of a skirt attached at itsupper edge to the deiector and at its lower edge to a metal ring 16, asshown in Fig. 2, said ring being below the top of the stack.

A conical detlector D, having a central cone a and a circular web 5 ofsomewhat greater diameter than the stack, is located centrally and at ashort distance above the top of the ing.

stack. This deiiector is provided with a shank G, which isscrew-threaded, and it is adjustably supported upon the spiderframe bymeans of the nuts 7, as shown in Figs. l and 2. The function of thisdeector is to throw the sparks downward into the conical casing and itis made adjustable, so that it may be accommodated to different amountsof draft from the stack and different kinds of fuel. As an additionalsupport for the delector, screw-threaded rods 2O may be used to connectit with the stack, as shown in Figs. 1 and 2.

At the bottom of the casing is provided openings O for the discharge ofthe cinders, and from these openings pipes P convey the cinders to theground or to any suitable receptacle. There there isa forced draft, asis common in locomotives, the pressure within the casing will tend tocarry the cinders through the opening and pipes; but in order to insurethe discharge of the cinders and also to put out any which may be stillburning I introduce a jet of steam at the openings O, thus formingejectors. This steam is supplied through pipes 8 from the boiler.

Between the stack and the casing plates M are arranged so as to guidethe cinders toward the openings in the bottom of the cas- These platesare preferably four in number, and they extend upward spirally aroundthe stack, one either side of each opening O, the upper edges of theplates meeting at i) and forming wedges which do not interfere with thedownward course of the sparks. These plates, together with the casingand the sides of the stack, form tunnels which collect the sparks at theopenings O, through which they are discharged. I will hereinafter dcsignate the plates M as collecting-plates.

To prevent counter-currents from carrying any of the sparks upward andto preclude the possibility of their escape, I sometimes introducebathe-plates l0 11 within the casing and upon the stack. few inches inwidth and inclined downward, as shown.

In operation the hot gases, smoke, and cinders which are ejected fromthe stack are deiiected downward into the casing by the cone Theseplates are a IOC defiector D. The sparks by their superior weight andmomentum are carried down into the funnels formed Within the casing,While the smoke and gases escape through the netting or through the opentop above the delector. The steam-ejectors keep the openings in thebottoms of the funnels always clear, the sparks being rapidly dischargedthrough the pipes P and et the seme time quenched.

Without limiting myself to the precise construction and arrangementshown, I claim- The spark-arrester consisting, in combination with thestack, of the conical casing surrounding the upper end of the stack andhavnaine to this specification in the presence of z 5 two subscribingWitnesses. PHILIP MARTIN LOW.

Witnesses: v

RoBERT G. MoRRoW, HARRISON G. PLATT.

